#showImg{
    background: rgba(46,54,63,0.8);;
    position: fixed;
    left:0;
    top:0;
    right: 0;
    bottom:0;
    z-index: 999999;
    overflow: auto;
}
#showImg .box{
    display:block;
    height:500px;
    width:500px;
    position:absolute;
    top:5%;
    left:50%;
    margin-left:-250px;
    padding:20px;
    background:#eaeaea;
}